Stapling machine



June 13, 1944. H. SHELLER STAPLING MACHINE Filed Jun 25, 1942 iNVENTOR mMa Q E. E m HMO s. T mum O HS 5 n m In 4 .6 F

Patented June 13, 1944 UNITED STATES PATENT orm STAPLING MACHINE HaroldS. Heller, Cleveland Heights, Ohio Application June 25, 1942, Serial No.448,358;

4 Claims.

This invention relates to staple driving machines, and more particularlyto those which employ U-form wire staples, from the crown of which aportion is removed, so that the staple legs are driven and serve afterthe manner of small brads, tacks or nails.

One object of the invention is to provide an improvedmachine of thiskind particularly designed for use with a U-form staple having itscrown'weakened in such manner that the machine itself, during the normaloperation of driving the staple into the work, and without the use ofextra staple shearing, cutting or deform.- ing parts, accomplishes notonly the driving of the two spaced staple legs but alsoremoval of theexcess metal of the crown between them.

A further object is to provide an improved stapling machine, the drivingtool of which applies driving impact to a staple only at the upper endsof its legs, while the cross connecting crown piece maintains the legsin correct driving position, enabling them accurately to be drivenendwise into the work, but finally leaving behind them the crown portionof the staple by severing it along weakened lines near to but spacedfrom the legs, to provide a head for each leg.

A further object is to provide an improved machine of this kind which isof simple construction; which may be used efficiently with standardstaples as an ordinary tool; and which, when used With'weakened wirestaples, converts them in effect into headed brads and drives them to adepth sufiicient to bu y or countersink their heads in the work.

Further objects of the invention are in part obvious and in part willappear more in detail hereinafter.

. -In the drawing, which represents one suitable embodiment of theinvention, Fig. 1 is a side elevation;

Fig. 2 is a detail sectional elevation on approximately the line 2-2,Fig. 1, looking in the direction of the arrows, and showing the drivingtool ready to engage a staple for driving the same;

i Fig. 3 is a similar view showing the staple partly driven; v

Fig. .l is a similar view, showing the parts in their positions justbefore the shearing. opera tion begins; 1

Fig. 5 is a similar view, but illustrating only the work andstaple, withthe parts in their final positions;

Fig, 6 is a detail sectional plan view on the line B t-F1813? Fig. 7 isa perspective view, on a larger scale, illustrating one form of staplewhich may be used;

Fig. 8 is a similar view of another form of staple; and

Fig. 9 is a plan view of the finished work.

The invention now to be described is an improvement upon that shown,described and claimed in my prior application for Stapling machine,filed Decemberv 8, 1941, Serial No. 422,077, to which reference may behad if desirable or necessary. In said application the stapling machineoperates upon standard U-form wire staples, being provided with ashearing anvil which cooperates with the driving tool to shear away aportion of the staple crown just before the heads of the remaining bradform staple legs are countersunk into the work.

According to the present invention, a special form of U-form staple isemployed, made of a piece of wire of uniform cross section, having itscrown portion cut, indented or otherwise weakened at two points near tobut spaced from the legs in such manner that the end shoulders of thetwo arms of the staple driving tool come near to or register with saidweakened portions and accomplish severance of the wire when the staplecrown engages the face of the work. This reduces wear and tear on themachine parts, relieves them of some duty,-dispenses with an extra anvilpart, and nevertheless accomplishes the task efllciently andsatisfactorily.

'The operating parts of the stapling machine, I

for the purpose. As shown, they comprise a hollow body or frame I,within which the operating parts are housed or enclosed. The stapledrivingtool 2 moves in a channel or guideway 3, being-operated bypressure or impact of the hand upon the head 4 of .a plunger 5 biasedupwardly by the usual compression spring 6. Staples are'fed one by oneto said channel ahead of the driving tool, said'staples being advancedalong a track orguideway I by a follower 8, as

is usual.

Any suitable form of staple may be employed. The drawing shows a staplell! of generally U- form made from'a long length of wire of uniformrectangular cross section bent at two points Illa to form parallel legsll connected by a cross bridge or crown member l2; the arrangement pesenting curved surfaces of the metal upward to said channel, and adriving tool movable in said channel and having its leading edge portionrecessed between its ends to provide two driving arms, one on eitherside of the recess, and having depending projections at the outer endsof said arms, to thereby conform the arms to the heads, the tool recessforming two edge portions located so as to engage the staple near to itsweakened portions, whereby the staple crown at its ends is embraced byand held between said projections during the driving operation and theheads are severed from the crown when it engages the work and both thelegs and heads may be driven into the work without distortion at thebend between them.

2. A stapling machine for use with U-form staples having the crownportion weakened at two points near to but spaced from the legs toprovide a head for each leg, comprising a frame provided with a stapleguiding channel having an open mouth adapted to be applied to the work,an operating plunger, a tool operated thereby and slidable back andforth in said channel, said channel being open and unobstructed acrossits full area from the driving end of the tool to said mouth, and meanfor supplying staples one by one to said channel to a point in advanceof the driving tool when the latter is in retracted position, saiddriving tool being provided with two arms spaced apart on opposite sidesof a recess and having edge portions located so as to engage the staplecrown near to its weakened portions, to there sever the legs from thecrown when it engages the work and drive the legs and their heads intothe work.

3. A stapling machine for use with U-form staples, comprising a frameprovided with a staple guiding channel having an open mouth adapted tobe applied to the work, an operating plunger, a tool operated therebyand slidable back and forth in said channel, said channel being open andunobstructed across its full area from the driving end of the tool tosaid mouth, and means for supplying staples one by one to said channe1to a point in advance of the driving tool when the latter is inretracted position, that portion of the machine frame adjacent thechannel mouth which engages the work having a shouldered grooveextending parallel to the length of the said channel mouth with theshoulder of said groove parallel to and at one side of the crown of astaple being driven, to accurately locate the staple legs with referenceto the shoulder of said groove and to space them apart lengthwise of thework.

4. A stapling machine for use with U-form staples having the crownportion weakened at two points near to but spaced from the legs toprovide a head for each leg, comprising a frame provided with a stapleguiding channel having an open mouth adapted to be applied to the work,an operating plunger, a tool operated thereby and slidable back andforth in said channel, said channel being open and unobstructed acrossits full area from the driving end of the tool to said mouth, and meansfor supplying staples one by one to said channel to a point in advanceof the driving tool when the latter is in retracted position, saiddriving tool being provided with two arm spaced apart on opposite sidesof a recess and having inner edge portions located so as to engage thestaple crown near to its weakened portions, that portion of the machineframe adjacent the channel mouth which engages the work having ashouldered groove extending parallel to the length of the said channelmouth with the shoulder of said groove parallel to and offset from thelength of the crown of a staple being driven, to thereby sever the legsfrom the crown when it engages the work and drive the legs and theirheads into the work at two points accurately spaced from the shoulder ofsaid groove and spaced apart lengthwise of the work.

HAROLD S. HELLER.

